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x in (-oo:+oo)
(x+y)/z = a // - a
(x+y)/z-a = 0
(x+y)/z+(-a*z)/z = 0
x-a*z+y = 0
x-(a*z)+y = 0
(x-(a*z)+y)/z = 0
(x-(a*z)+y)/z = 0 // * z
x-(a*z)+y = 0
x-(a*z)+y = 0 // - y-(a*z)
x = -(y-(a*z))
x = a*z-y
x = a*z-y
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